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Mark T. O'Brien, D.O., P.C.

Family Medicine Physician in East China, MI · enumerated 2007 · authorized official Mark O'Brien, Owner.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1396943015

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Registry record

Entity type Organization (Type 2)
Legal business name Mark T. O'Brien, D.O., P.C.
Practice address 4150 River Rd, Suite F2, East China, MI, 48054
Phone (810) 329-4660
Fax (810) 329-4699
Enumeration date Jul 3, 2007
Last updated in NPPES Aug 22, 2020

Taxonomy & classification

207Q00000X Family Medicine Physician Allopathic & Osteopathic Physicians · License 5101009744 (MI) Primary

Authorized official

Name Mark O'Brien
Title Owner
Phone (810) 329-4660

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

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Frequently asked questions

Who is the authorized official for Mark T. O'Brien, D.O., P.C.?
NPPES lists Mark O'Brien (Owner) as the authorized official for this organization.
What is the NPI number for Mark T. O'Brien, D.O., P.C.?
The NPI for Mark T. O'Brien, D.O., P.C. is 1396943015, a Type 2 (organization) record in the CMS NPPES registry.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-08-22.